Machias is the county seat of Washington County in downeast Maine, United States.

It is home to the University of Maine at Machias and Machias Valley Airport, a small public airport owned by the town. The word Machias roughly translates in Passamaquoddy as "bad little falls", a reference to the Machias River. Machias is best known as the site of the first naval battle in the American Revolution.

Machias is situated midway on the south shore of the county, on the Machias River, near its mouth. The western portion extends southward to Little Kennebec Bay. Machiasport bounds it on the south-east, also on the east with East Machias and Marshfield. The latter also bounds it on the north, and Whitneyville and Jonesboro on the west.

According to the US census, the town has a total area of 14.8 square miles, of which, 13.9 square miles is land and 0.9 square miles, or 6.09%, is water. The town is located at the head of Machias Bay and Little Kennebec Bay on the Gulf of Maine, part of the Atlantic Ocean.

It is bordered by the towns of Machiasport to the east, Roque Bluffs to the south, Whitneyville to the west, and Marshfield to the north. Separated by water, it is near town of East Machias to the north.

As of the 2010 census, there were 2,221 people residing in the town, and according to the 2000 census there were 939 households, and 503 families residing in the town. The population density was 169.4 people per square mile. There were 1,129 housing units at an average density of 81.3 per square mile.

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